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Can anyone tell me what I have smog related on my California 91 X. I say 91 because I think newer 1st gen had stricter smog. Anyways besides cats, what else is there I can yank off that robs horsepower or is useless? This will be strickly offroad soon so I dont need to smog it anymore. thanks

On the passenger side upper manifold there is a sensor with a plug. Is this the O2 sensor? There is another one behind it with multiple tubes hooked up to other parts. Is this for smog purposes? Please correct me if I am incorrect with either. thanks.

Can someone please explain to me how our iac works? There are no hoses so is it the type that uses the motor to open and close the throttle bypass? Where does the air flow come from if there are no open vents or hoses coming from the iac. If I relocated it somewhere else on the manifold would it...

lets say I replace my upper manifold and replace it with a throttle body,elbow,supercharger from a cobra mustang. The elbow which is inbetween the supercharger and the throttle body has the same mount as my IAC motor, but the way that the iac valve works it will be useless with the different...

I need to change out my stock 19# injectors for a higher number for part of my supercharger project. To me it seems like there are two types, one skinny and one fatter. Are all the fat ones interchangable and vice versa? I looked at a thread that a guy had 42# lightning injectors on his...

Dumb but useful question. I've got exhaust and intake so I was looking into getting the KKB throttle body. Its a pretty penny at 229 on ebay. I'm also always on the look for a used OHV paxton/eaton supercharger kit. Do these kits use the stock throttle body or do they have throttle bodies built...

I'm being proactive before my A4ld goes out soon, which is inevitable from reading posts. I was looking in to either getting the A4ld built stronger, c4 conversion, or 700r4 conversion. Anyone know someone reliable in Southern CA that I can call for prices and advice on which one to do?

In regards to the 4x4 front dana 35. Can anyone tell me the name of the part that goes over the axle shaft? Its after you take the hub and rotors off and there is a cone shaped sleeve over the axle shaft that is bolted up with 5 bolts in a circular pattern. +

2 part question. I plan on going to the junkyard to bet a bigger maf for my 4.0. Whats the best performance matchup? v6 mustang, 5.0 explorer/mustang? not feeling the plastic ones either. Next, do I just use the housing and keep my stock electronics or do I use the new sensor and plug that it...

I have my exhaust turned down before the axle for clearance but I put on a stock muffler because it was too loud in the cab, but I have an exhaust cutout right past the manifolds that I open when I offroad. I also have a KKM intake and plan to get a maf sensor off a 5.0 and also get the BBK...

I know they make supercharger kits for the SOHC. But do they make a super or turbo kit for our first gen OHV engines?

I have a big flowmaster which usually makes it much quieter, but the problem is I have a turndown before the axle and inside the cab is too loud. I need to keep the pipe before the axle so I was wondering if anyone has done a turnout instead of turndown before the axle? Will this make it alot...

I'm currently waiting for my my 4.56's from ebay to swap out my 3.55's. 4.56 should be lower than stock gearing for my 33's I believe while 4.10's would be closer to stock. So my question is, am I going to be quicker off the line than when I had stock tires with my 3.55's? Or because the tires...

Went offroading and my battery came loose and pulled some wires from the positive and negative cables. I was able to reconnect most of them to start my X back up again but I was unable to connect one wire from the negative terminal because of lack of length. Its a small wire that goes to a...

I want to get an aluminum diff cover. Got drain plugs,lighter and look sweet. The more expensive ones have screws that reinforce the main bearings. What do the main bearings do and how does it help to reinforce them?

I removed the lining under the hood today (had tranny fluid from a leak that shot out from my radiator, and was ripped after my battery came loose while froading). I uncovered a wire with a plastic thing on the end that came up halfway up the hood on the drivers side. What is it? A light that...

Is there a rear abs fuse for 91x? I want to disconnect it. I tried to pull the relays but I only have 3, 2 of them the car wont start and 1 the a/c wont work.

I want to mount a toolbox in the rear compartment. I pulled the carpet so I can weld or bolt it. Looking for tips on how to mount it? Im prerunning not rock crawling. Essential tools? How to keep tools from flying around?

I just upgraded to an aluminum radiator with 3 rows. It runs much cooler and I gained some horsepower. The thing is, when its cool the radiator is full and the overflow tank is full also. Then when I check it while its hot, the overflow coolant is still there. Is this normal or do I need to get...

Can anyone tell me which relays are which on a 91 explorer. Mine are under the fuse box. If your looking down on them from the top of the hood what are they from left to right? I want to pull abs. There are two right?

Is the oil gauge on the left side oil temp or oil pressure. It just has an L and H for low and high.

I pulled my floor carpet and headliner and am cleaning up wires that are not being used. There is a grey harness connected right below the ash tray that runs under the driver seat. It looks like it goes into a rubber plug on the floor and am thinking this is for the 4x4 motor. Is this what the...

I recently have had 3 front end alignments over the last 6 months due to my suspension shop having to correct some things (alignment cams popping out). Each time days later the car would start dragging right. The passenger tire visually looks off caster and camber a bit. I started to have...

im looking on ebay for 4.10 gears. I saw this company "assault" that has "racing/offroad" gears that they say will make more noise when installed. I won't get them based on that alone, but was wondering what was different about them that makes them noisier?

So ive looked up all the posts on 4.10 vs 4.56 and ive decided to go with 4.10's because im desert racing (dirt not sand), not 4x4ing much and it's also my daily driver. I currently have 3.55's and 31" tires. I'm going to bump up to 33" (10.5" wide, not 12.5") and im not ever going up to 35"...